Means for resurfacing cylinders



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BATZS 1919 5 Sheets-Sheet 1 3mm/tou @laf a @ademen @Wu-'E O A ANDERSON ET AL MEANS FOR RESURFACING GYLINDERS @et 3Q, 1923.

o. A. ANDERSON ET AL MEANS FOR RESURFACING CYLINDERS Filed July 14, 1919 s sheets-smet 2 @CL 3Q, 192.3. mmm@ V(D. A. ANDERSON ET AL MEANS, FOR RESURFACING CYLINDERS Filed July 14, 1919, 5 sheets-sheet 5 Patented @et 3G, ll923 PATENT OLAF A. ANDERSON AND HG1-IN Ell". MACRAE, OF DETRGET, 'ICHIGAN, ASSZGNORS T0 MXCHIGAN MACHINE C0., 0F DETROIT, MXCHIGAN, A CORPORATION OF MICHIGAN.

lvIEANS FOR BESURFCING CYLINDERS.

Application filed July 14,

T0 all who/n t may concern Be it known that we, OLAF A. ANDERSON and donn Mimizan, citizens of the United States et America, residing at Detroit and Dearborn, respectively, in the county of lVayne and State of Michigan, have invented certain new and useful improvements in Means tor Resurfacing Cylinders, 0i `which the following is a specilication, reference being had therein to the accompanying drawing'.

This invention relates to improvements in means -for resurfacingcylinders, pertaining more particularly tovtractors adapted for resurfacing the cylinders et internal combustion motors.

As is well understood, the cylinders of internal combustion motors become worn and otherwise made ine'tlicient through decrease in compression ability, etc., and it is the general practicewhen this condition becomes excessivewto renew the original conditions 'by producing a new surface in the cylinder bore and substitute a piston oli' an increased diameter, thus producing more or less the original conditions excepting possibly in the slightly increased capacity ot the cylinder space 'through the slight increase in diameter ot the cylinder bore. This re-sur- Vfacinga may be provided bv simply re-boring the cylinder, or by providing such re-boring action and then subjecting the surface thus produce'l to burnishing action.

The diiiiculties ot resurfacing); cylinders flow mainly from the tact such cylinders are enerally cast as part of a block, thus reokuirinpj special machinery7 or tools for proeither al single re-boring; operation or such operation with a hurrishing opera-tion; i*Y being readily understood that where a nrality of cylinders .are in the torni of a unitary structure, it becomes a ditcult matier lo provide relative movements between the cylinder and the boring or burnishing tool necessarv in providing` the Yresurfacing,r ope ation. Machines capable of producing this result have ol" course. been developed, but such machines are vgenerally ot a special type and are to be Vfound mainly in the manufacturing plants ot the motors. As a result, it is a Lfencral practice to remove the cylinder blocks from motor found to be suthciently `laulty to require such re-surfacingr` and then ship the blocks to a manufacturin plant where it can be properly re-sur- 1919. Serial No. 310,770.

faced, thus not only entailing considerable loss of time but making it a more or less eX- pensive operation. jWhere machines tor the purpose are installed at non-manuliacturing` plants, the cost to the owner of the cylinder is generally excessive, since the operations of such machines at isolated plants is intrequent, and hence the charge for service must be'sutliciently high to cover the cost and overhead charges for operating' machines o1n this special type at infrequent intervals.'

The present invention is designed to meet these conditions by the production of a mechanism of relative low cost of manufacture, which will provide for eliicient operation, and which is portable. Such apparatus can be carried among the tools of a garage without materially increasing overhead charges, so that such ire-surfacingr operation can be provided without shipping the cylinder blocks to the manufacturer, since the resurfacingl can be provided at the point where the motor is taken down to remove such block, thus not only decreasing the cost of installation of the tool, butA providing for a saving in time required to place the cylinder into service and decreasing the cost of the resurfacing operation.

To these and other ends, the nature ot which will be readily understood asthc invention is hereinafter disclosed, said invention consists in the improved construction and combination of parts, hereinafter fully described, illustrated in the accompanying drawings, and more particularly pointed out in the appended claims.

In the accompanying drawings, in which similar reference characters indicate similar parts in each of the views,-

Figure l is a. central longituoinal sectional view of an apparatus or tool assembly constructed in accordance with one embodiment of the invention, the apparatus being shown in operative position relative to a cylinder of the cylinder block of a standard type of internal combustion motor. the view illustrating the arrangement of parts when the ifo-boring oit' the cylinder is takingr place;

Fig'. 2`is a similar View showingl the position of parts and the general arrangement when a burnishing action in employed;

Fig. 3 is a sectional view takenv on the line 3 3 of Fig. 2. Y i y Fig. l :is a detailed'sectional view taken on the line 4 4 of Fig. l;

Fig. 5 is a detail sectional View. Y Fig.` 6 is a detail sectional View taken through the burnishing tool or member;y

and

ofthe burnishing tool.V

V rPheapparatus of a type adapted'to operate upon one cylinder ata time and is of such construction as'to permit of its bel Ving temporarily secured inposition relatiye to the cylinder to be surfaced, the arrange nient being. such that the.-work-performing element-the cutting tool or the'burnishing V tool-is rotated within the cylinder, the

rotation` operatingto provide the desired speed of thev tool in the direction of length of the cylinderduring suchl rotation. Since itis an absolutel requirement that an appa.- ratus of thisl kind provides for' accuracy, the apparatus is of such type as t'o'perinit it to .be accurately positioned relative to the cylinder soV as tocause the tool to produce the proper surface. f

The apparatus is composed: generally ot two elements, or, parts A; and B, these' elements being structurally independent but cooperating.A in locating the. apparatus iin properv position relative to the cylinder', element A being adaptedto be securedin position relative` tol one end of.vr the cylinder Y or cylinder block, element B being secured at the opposite end of the cylinder or; block, the two elements cooperating. within the cylinder or blockl in producing the generalassembly. f

For purposesI of illustration, wey have shown` the., apparatus, ask positioned within a cylinder cot a cylinderlblock- C, the latter being a unit-otv agvell knowntype of motor in which aportion ofthe crank. case is formed integral with:the. block, this por-v tion being indicatedat .0.- In the particular embodiment shown in thefdrawings,

element Bhas a contigurationsuch as will I permit it to be rsecured to the Vflanged portions otthe crankcase section ofthe block, as for instance, by being` bolted thereto with the bolts occupying the usual bolt openings l ofthe flange normally usedfor securing the blockl in its proper.y position inthe motor structure. The. general arrangement. of vele-V4 ment B is such :that when secured in position,a pin orstud'--b-, proyecting inwardly into the crank case section, `Willfbe axially alined with the axis of the cylinder bore,V

said pin or stud forming a steadying memberfor element A whenthe latter isV in position.

Element A comprises an assembly of parts supported at the opposite endof the cylinder bore, and is adaptedto be boltedtothev cyl-l inder casing after, the assembly has been` properly positioned as presently. pointed out, the element 'carrying suitable@ opelaningsy or recesses vthrou h. which the bolts extend..

" nina 'pariauiiaeaaiianieni ifi the ia .Fig 7 is a fragmentary view in elevationv .eating these vention disclosed in the'present application elemente` embodies a tubular member l0 operative to carrythe-toolfina generally circular path during the work-performing operation. anda feed screw l1 rotatably mounted'. to feed the boring tool 'while the i latter is providing its cutting operation, the

element c arryingfmeans fork properly lo! parts andp'roviding their operation. Y Y Y 1 As shown-'in Figs. l and 2, vthe tool carrying member vl0 has a length greater than the length of the bore of the cylinder, Vthe projecting lower `end having an opening l0 which'is adapted to receive the pin or stud '-5'- lot elementl B, lmember 10 extending into the crank case se'ctiona distance suiiicient to provide this result. The opposite end( of ymember l0 is shown-as being` enlarged diametrically, thus! providing an external surfaceextending in two different planes, a

these being joinedrby an annularly extending flange portionwhich is adapted toproduce a shoulder face l0?, seatedon a seating yface 12a of asupporting frame member l2',

the latter Yin'tiirn having a face which seats on the end of thek cylinder block-the open Y Y end ofy the cylinder being operated upon.

As shownrmore particularly in Figs. lrY

and ,2,'th'e member 10 is provided with a vlongitudinal slot 10c, this slot vextending throughout the major portion of the length of the'smaller diameter portion of member l0, said .slot communicating with the interior of the member for adistance which extends beyond the' opposite yend vof the cylinder bore, the inner end ofl the slot being adjacent the plane of shoulder 10b- Figs l and 24-the outer 'end of theslot being closed to the interior of the member, but continued to the latter in the `forin of a keyway i0 'for a purpose presently described.V

As shownV in Figs, ll andQ, seating face l2 is spacedv a considerable distance from the plane of the end of the cylinder block, the intermediate portion of the 'support l2 having a cylindrical' bore of greater diameter than the smaller-diameter portion otx member 10, andhaving at least a major portionV of this bore of greater diameter than the bore of the cylinder, for reasons presently pointed out, this portion of the support bemade possible by the :tact that the travel ot' the piston Within the cylinder bore ot a cylinder does not carry the piston to the outer end ot the bore, the result being that there is a portion of the cylinder bore at the outer end ot Jdie bore `ntained unailected by Wear the piston, so that at this end ot the b re the cylinder retains the characteristics ot the orininal bore. `Since it is the practice oit' manufacturers to provide bores of similar diameter, it will be readily understood that this particular portion ot the cylinder bore remains on the general standard ot diameter regardless of Wear of other parts oit the bore, so that it is possible to provide a corresponding' standard diameter to that portion of the bore of support 12 which is located between the seating,- face of the support and openings 12b, thus producing an internal bore oi" support 12 which canv be accurately alined with the adiacent portion ot the cylinder bore, l1", then, a part 13a be introduced through one ot the openings 12 and dropped. between the alined here surtace and the outer surface ot member '10, with the member extending beyond plane ot the seating` tace ot support iik-see Fig: i-support 12 will be held in its alined position with member extending` in axial alineuient with the aris ot the bore and be maintained in such position during the time reuired 'for securingelement A, to the block by the bolts after which the locating members are removed; pin or stud -Z- serves to prevent springingl or otherwise shittingf the opposite outer end oit member 10 during the cutting operation.

The upper enlarged portion of member 10 is provided With an internal gear 111, the particular embodiment disclosed in the drawings showing this `ear located subw stantially at the inner end of the enlarged bore ot the member, the gear beingr termed integral with or as a separate structure secured to the member in suitable n'ianner.

lli/llember .10 is held against endwise movement by means ot cap 15 removably seated on the upper tace ot support 1.2, beinfr secured in position by any suitable moans such as bolts. ISaid cap member serves as supporting structure ter a number of operating parts which will now be described.

16 indicates a pinion niounted a stub shaft "7 carried by the cap member. pinion in mesh with `gear 14;. Pinion 1G is also uf molly in mesh with the teeth ot a sleeve 1S mounted in the cap member and tluourfh which the feed member 11 extends, sleeve 1S serving' asa support tor the vinner end ot the 'feed member 11. the outer or opposite end ot' said member 11 being supported in a block 11a located at the outer end of the bore ot member 10, block 11a having a portion extending into opening` 10a of member 10, the walls ot said opening 'thus actingto delinitely locate this end of the 'feed member axially alined with the axis ot member 10. The opposite end ot the feed member is held on such axis through its location in sleeve 18, said sleeve being also arranged to be axially alined with tie axis oit member 10.

19 designates a member secured to and rotatable with the feed member 11, member 19 having portion fitting Within the bore of member 10, and also having a flange enH tending laterally (in the direction ot the axis oi" the member), said flange, indicated at 19, be' ig located between the piane oi' pinion 16 and the inner face or" member 19 as shown in FigsA and 2., Flange 19:L also carries a gear tace as indicated at 19, said gear face being in mesh With a pinion 2O carried by a stub shaft 21 supported in the cap memoer 15. Pinion 2O is also adapted to mesh With the teeth ot sleeve 18, the general arrangement being` such that pinions 16 and '2O are located on different planes extending transversely ot feed member 11, and theretore have their meshing; planes with the teeth oie sleeve 18 on different portions of the teeth, the sleeve teeth length being sut* ticient to operate in connection with both pinions.

As Will be understood, stub siafts are located at any desired points vithm each 21 i the cap member out ot alincment witl oth r, the drawings shes/inothe locations to be substantially on one or the diameters of member 10, the shafts being located on opposite sides ot the feed-member 11.

22 indicates the boring tool assen'ibly, thi, being of any suitable type, the drawing showing a member threaded on Jfeed membe..` 11 and having` its outer tace substantialli-,fv fitting' the bore oit member 10, the particular structure indicating` the use of a Babbitt metal iace contacting with the thread ot the feed member. This portion ot the assembly indicated 22a is adapted to detachably receivea cutting tool 22b ot proper configurar tion and which extends through the slot oit member 10, the Walls ot said slot serving to guide the cutting' member 22 and prevent relative rotational movement between meinA ber 22"L and member 10.

By reason of this latter will be readily7 understood 10 be rotatedy the cutting uulv i be carried around with the uiemben and it the assembly 22 be shifted longitudinally ot member 10 through the action of the toed member 11, the rotation ot member 10 will cause the cutting tool 221V to provide a cutting action on the bore `tace oit thecylinderq the cut-ting tool having a circular path of movement which varies from a single transverse plane oit the feed member 11 equal to the amount ot advance which said feed member is designed to provide. Obviouslyv` any attemptV to produce the small advance ratio to assembly 22 required in attempting to produce a boring cut* to the cylinder by simply carrying the assembly about' the thread of a stationary, member, would be commercially useless, lacking .thepower to force the cutting tool Vto ladvance if the thread pitch be of a type to provide for this small advance.l Y

To provide for proper Vfeed action, andY at the same time produce the desired resistvance of the tool during the strain of cutare such that during one revolution ofv Vmember 10, member 11 gains one-twelft of a revolution, so that as member 10 makes twelve revolutions, assembly 22 will be advanced a distance corresponding to the pitch of one thread of the feed member 11 in the direction of the axis of member 10. Obviously, the differential of gears may be varied to meet the general requirement-s, that pointed out being` one which permits the cutting operations to be performed within wir the limits of safety and etticiency.

The drive is provided by a suitable mechanism operatively connected with sleeve 18.

The structure shown in the drawings is adapted for use in connection with hand labor, and for this reason the operating device is shown as in the form of a handle 28, removably secured to the upper end of sleeve 18. Rotation of the handle causes the sleeve to drive the pinions and the gear faces of members 10 and 11, thus causing these members to rotate in the same direction but at different speeds. Obviously, the power may be applied otherwise by suitable gearing on the -sleeve or the drive may be from a power device, the particular form of drive for sleeve 19 being such as may be found desirable or preferable.

As will be understood, if the cutting assembly be located to bring the cutting point of its tool at the proper point at the upper end of the cylinder, Fig. 1, and the handle be rotatedythe gradual advance will carry the assembly to the bottom or outer end of the member 10 and through the inner end of the cylinder bore, thus providing an enlarge-l ment on the bore to the dimensions provided b v the cutting tool itself. Obviously, this places thecutting tool at the opposite end of the cylinder bore from that at which support 12 is located, and it is therefore essential, in order that element A may be read lef/,2,036

ily removed, that the cutting assembly returned to the opposite end of the element. lnorder to permit this to be done in a .rapid manner and without materially affecting-,the y face which was produced during .the boring operation, provision is made for returning the cutting assemblyV rapidly and in a straight line through the bore, this result Vbeing obtained by retaining member 10 Amember 11 to rotate at equal speed therewith without activity of either pinion 1G or 20, member 10 thus remaining stationary', member llbeing connected direct to'sleeve 18 instead of indirect through member 1 9 and pinion 20. i f

As will be understood, this change in operation thus described,practically requires `the shifting of sleeve 18 between two positions. s it is desirable thatV assurance will be had that the sleeve will be properly operative in either of said positions, we prefer to provide the boreof the sleeve with an# nular grooves 18b and 18", and providey a yieldable element, shown as in the ferm of a ball 241., within the feed member1 11'. The positions of grooves18b and 18C are such that when the ball engages groove 18h, sleeve 1S will be in position to provide a differential feed movement to the tool to advance the latter in the cutting path; when the sleeve is shifted to provide engagement of the ball with groove 18C, disengagement ofl the sleeve teeth vand the teeth'ofpinions 16 and 2O will take place and the direct'drive Y ofthe feed member will be provided'. As will be `understood the particular retaining structure b v which the sleeve may loe positioned in eitlicrtoi" a plurality of positions, is more or less illustrative; the particular arrangement shown permits the shifting of the sleeve to be had without affecting the handle, the shift beingr obtained by simply moving the handle outwardly, thus carrying the sleeve with it.

The normal inoperative position of the assembly 22 is with the cutting tool located within that portion of the bore of support 12' which is of larger diameter, thus locating the tool above the plane of the cylinder block and therefore Vout of position within the bore, the position shown in Fig. 2.

Shuld it be desired that the operation include only this boring ofthe cylinder, the

apparatus can be readily removed by simply removing element B fromthe cra-nk case portion of the cylinder block and element A from the opposite end of the cylinder bore. llowever, it is preferable in producing a proper resurfacing action that the bored surface be subjected to a burnishing action, and this is provided by the use of an attachment shown more particularly in Figs. 6 and T and shown in position in Figs. 2 and 3.

This attachment is shown as in the form of an annular member 25 having an internal diameter adapted to fit over the outer face of member' 10, said member 25 having an inwardly extending key 25a which is adapted to travel in slot 10c of member 10, the key being of a size to prevent relative rotation of member 25 and member lOyet be capable passing through the keyway 10b of mem ber 10.

The cuter periphery. of member 25 is provided with a plurality of rolls 2b', mounted in suitable bearings formed in member 25, said rolls having their axes extending in a direction inclined to the axis of the member. as shown more particularly in Fig. 7, each roll having its axis inclined at the same angle as the other rolls.

VJhen it is desired to use the burnishing attachment, element B is removed from its position, and the attachment 25 located over the cuter or lower end of member 10, key passing through keyway 1()b into slot 10C, the movement of the attachment being continued until it is entered into the bore of the cylinder, whereupon element B is returned to its position.

Burnishing action is had by rotating member 1G, rotation of this member notV only causing the rolls 26 to act to burnish the interior of the bore, but the inclination of the roll axis acts to provide a feed movement of the attachment in a direction upward in Fig. 2, carrying the attachment toward the opposite end of the bore, the several movements combining to burnish the interior of the cylinder and practically eliminate any markings that might have been provided by the cutting action or during the return of the tool.

liiring this 'burnishing action it is preferable that the cutting tool remain in its noi mal inactive position, and to provide this result, the feed member 11 is temporarily disconnected from sleeve 18 by positioning the latter at such point as will permit engagement of the teeth of the sleeve with the teeth of pinion 1b' but will prevent engagement of sleeve 18 with pinion 20, this result being brought about through the location of pinions 1G and 20 on different planes heretofore described. The sleeve is maintained in this position during rotation by the engage nient of ball 241 with an additional groove 18" of the sleeve, this groove being located sleeve in this position member 11 is free from direct connection with the sleeve, and mem-V ber 19 is free from drive engagement with the teeth 4of sleeve 18, so that member 11 and member 19 are free to rotate with member l() as the latter carries the cutting assembly around it, the latter simply carrying the tool around within the space surrounding the member 10 within the support 12, members l and 11 thus traveling in unison and not at differential speeds during this period.

Ubviously the apparatus may be removed after completion of the travel of attachment Q inV this manner, or if desired, the direction of rotation of member may be reversed and the attachment caused to retrace its movement through the bore and thus subject the surface of the bore to a second burnishing action.

From the above it will be seen that We have provided an apparatus of simple form and comparatively light weight capable of successfully and eiiiciently re-surfaoing the bores of cylinders with accuracy and in such manner as not to require the use of special and expensive machinery; the various parts are not only rugged and substantial, but the general arrangement is such as to resist pressures which might tend to affect the accuracy of cutting and damage the interior of the cylinder. portable character and is such as can be carried as a part of the apparatus of the usual general garage so that there is no necessity for transporting cylinder blocks with a view to re-boring operations, thus providing a material saving in time to the user through the ability to produce the resurfacing action at the point where the block is removed from the motor assembly.

lWhile we have herein shown and described a preferred embodiment of the invention, it will be understood that changes or m0di fications therein may be required or found desirable in meeting the various exigiencies of use and of the diderent characteristics of individual types of cylinder blocks; we therefore desire to be understood as reserving the right to make anyV and all such changes or modifications therein as may be found necessary or essential, in so. far as the same may fall within the scope of the invention as expressed in the accompanying claims when broadly construed.

What We claim is 1. In portable apparatus for re-surfacing cylinders, a cutting tool, and means for supporting such tool relative to thev cylinder bore to provide tool movement in the direction of length of the bore with the move- `ment selectively through a cutting helical path or a path differing from such helical path in the rate of advance through the Obviously, the structure is of av bore under similar speed conditions of power application, said means including a-rotatable tubular element extending axially of'the bore and operative to drive andy guide the tool, means for advaiicingthe tool relative to the element during tool movementV in either path, and means positionable at opposite ends of the cylinderbore for supporting said tubular element with its axis alined with the bore axis, said advancing means including an actuating means forming Ythe powersource Jfor said elements during tool movement in either of such paths.

'2. In portable apparatus for re-'surfaci'ng cylinders, a cutting tool, and means for supporting such tool relative to the cylinder bore to provide tool vmoveiiient in the direction of length of' thebore with the movement selectively through a cutting helical path or a path diii'ering v'from such helical path in the rate or advance through the bore under similar speed conditions of power application,

said means including a rotatable tubular element extending axially ofthe ybore and operative to drive and guide the tool, means for` advancingl the tool relative to the ele- Vment during tool .movement in either path,

and means positionable at opposite ends of the cylinder bore for supporting said tubular element with its axis alined with the bore axis, said advancingemeans `including a ro- Y tatablc threaded element operative to advvance the tool during tool movement in either of suchpaths, said advancing means including an actuating means forming the power source for said elements during tool movement in either of such paths. Y y 3.,;'ln portable apparatus for re-surfacing cylinders, a cutting tool, 'and means for supporting such tool relative to the cylinderbore to -provide tool movement in the direction of lengthot the bore with the movement selectively through a cutting helical path or a path differing from such helical path in theV rate of `advance through the bore under simi- Y lar speed conditions of power application,

said means including a rotatable tubular ele- Y ment extending axially of the bore and voperative to drive and guide the tool, means for advancing the tooll relative to the element during toolV movement in either path, and means positionableY at opposite ends of the cylinder bore for supporting said tubular element With its axis alined with the bore *axisn said. advancing meansl including a threaded element rotatable in synchronism with the tubular elementto produce an ad-` vancing movement of the tool an axial distance less than the threadpitch7 saidV advancing means also including an actuating means formino' the power source `for said-elements during tool movement in either ol" such paths,

ayln portable apparatusor re-sur'facing cylinders, a cutting tool, and'means for 'sup-` porting such tool relative to the cylinder bore toprovide tool movement in the direction ofl length of the borewith the movement selectively through a cutting helical path or a path dilering from suchhelical path in the Y,

rate of advance through the bore under similar speed conditions of power application,

said means including a rotatable tubular element extending axially of ythe boreandoperative to drive and guideV the tool,means Yfor advancing the tool relative to the element .during toolvmovement .in either path, and

means positionableat opposite-ends of the .Cylinder bore for supporting said tubular element with its axis alined with the bore` axis, i said advancingl means including a threaded Y element rotatable in differential synchronismwith the tubular element to produce yan advancing movement of the tool an axialdistance less than the thread pitch, said i advancing means also including anactuating means forming `the power* source tor said Y elementsduring tool movement in either ot such paths. Y

5. Apparatus asin claim 4, characterized in that the rotative movements of the tubular and threaded elements are concurrent,l

when the tool is moving in one of such paths and relatively timed to require a plurality of rotations of the tubular element tov advance the tool an axial distance equalto the pitch of a thread ot the threaded element.

6. Apparatus as in claim 2 characterized in l'that both tubular andthreaded elements have lengths greater lthan the lengths oli the f V1mibore iof the cylinder.

7. Apparatus as in claim 2, characterized in that the tubular and threaded elements exdriven by a-diive member operatively contend on a common axis and are concurrently nected to both elements to produce synchronous movements therebetweenat differential speedwhen the tool is moving in oneot' such paths. l Y

8. In portable apparatus for resurfacing cylinders, a cutting tool, and means for supporting such tool vrelative to the cylinder bore to provide tool movement in' the direction of length of the bore with the movement i selectively through a cutting helicaljpatli or a being operatively connected'in such manner that the advancing means may move-concurrently with or independent of the tubular element at will, with the'concurrent action CAS titl

operative to produce tool movement in one pat-h and the independent action operative to produce tool movement in such path.

9. In portable apparatus for re-surtacing cylinders a cutting tool, and means 'for supporting such tool relative to the cylinder bore to provide tool movement in the direction of length of the bore -with the movement selectively through a cntting helical path or a path differing from such helical path in the rate `ot advance through the bore under similar speed conditions ot power application7 said means including a rotatable tubular element extending axially of the bore end @perfl to dri guide the tool, means for advancing the tool relative to the element during tool movement in either path, and means positionable at opposite ends oit the cylinder bore tor supporting said tubular element with its axis alined with the bore axis, said tubular element having an opening at one end, said supporting means including an element detachably secur-cd to the cylinder casing and having a pin projecting into said openingto form support to retain the tubular element in axial alinement.

l0. ln portable apparatus for resurfacing cylinders, a cutting tool, and means for supporting such tool relative to the cylinder bore to provide tool movement in the direction oi' length ot the bore with the movement sclectively through a cutting ielical path or path differing `lroro. such helical path in the rate or advance through the bore under similar speed conditions or" power application7 said means including a rotatable tubular element extendingaxially'or" the bore and operative to drive and to guide the tool, means for advancing the tool relative to the element during tool movement in either pathr` and means positionable at opposite ends ot the cylinder bore for supporting said tubular element with its vaxis alined With the bore axis, said tubular element and said advancing means being` operatively7 connected to permit concurent movement of the element and advancing means or independent movement or the advancing means at will, independent movement o't 'the advancing means being operative to iii-1 'e the tool in one et such paths, concurrent movement ott theelement and advancing means at ditlerential speeds being operative to move the tool in the other of such paths concurrent movenient oi element and advancing mei-tris at equal speeds being operative to move the tool in a circular path ifree from advance in the direction ot length ot the element.

il. In portable apparatus Jor rte-surfacing cylinders, a cutting tool, and means tor supporting such tool relative to the cylinder bore to provide tool movement in the direction ot length of the bore with the movement selectively7 through a cutting helical path or a path diitering from such helical path in the rate of advance through the bore under similar speed conditions of power application7 said means including a rotatable tubular element extending axially otn the bore and operative to dri *e and guide the tool, means for advancing the tool relative to the element during tool movement in either path, and means positionable opposite ends of the cylinder bore Jtor supporting said tubular element with its axis alined With the bore axis, said advancing means including a rotatable threaded element operative to advance the tool a distance less than the axial length oit a ti read duringa complete revolution ot such threaded element, said tubular element having an opening at one end,` said supporting means including an element detachably secured to the cylinder casing and having a pin projecting in said opening to :torni a support to retain the tubular element in its axial alinement.

l2. ln portable apparatus for resurfacing cylinders.; a cutting tool, and means for supporting such tool relative to the cylinder bore to provide tool movement in the direction oic length of the bore With themovement selectively 'through a cutting helical path or a path differing 'from such helical path in the rate of advance through the bore under similar speed conditions ot power application, said means including a rotatable tubular clement extending axially of the bore and operative to drive and guide the tool7 means for advancing the tool relative to the element during vtool movement in either path, and means positionable at opposite ends ci the cylinder bore tor supporting said tubular element with its axis alined with the bore axis, said advancing means including a rotatable threaded element operative to advance the tool a distance less than the axial length ot a thread during a complete revolution of such threaded element, said tubular element having an opening at one end of less diameter than the internal diameter of the elementto produce an internal shoulder7 and a member supported on said shoulder and positioned by sai opening for supporting one end ot the threaded element.

13. ln portable apparatus for resurfacing cylinders, a cutting tool*y and means for supporting such tool relative to the cylinder bore to provide tool movement through a circular path and advancement in the direction of the axis ot such path, said means including a rotatable tubular element extending axially of the bore and operative to drive and guide the tool, means for advancing the tool during element rotatiorn` and means positionable at opposite ends of the cylinder bore tor supporting said tubular element With its axis alined with the bore axis, said tubular element being slotted longitudinally,said

llO

cutting tool having a body portion Within the bore of the tubularelement and having its cutting portion positioned external of the element, said cutting and body portions being joined by connecting portions extending through and. substantially fitting 'the Width or" the element slot.

ist. ln'portable apparatus for re-surfacing cylinders, a cutting tool, and means for supporting such tool relative tothe cylinder bore to provide tool. movement.

through a ircuiar path and advancement inthe direction oit the axis of such path,v

saidmeans includingl .a rotatable tubular element en dini;` axially of the bore and operative to drive and guide the tool, ineang for advancing the Atooll during element rotationyand meer positionable at opposite vends ot tno cy er bore fii'or supporting said tubular element `with its axis alined with the bore axis, said advancing means including a rotatable threaded element extending axially ot said tubular element,V

said tubular 'element being rslotted longi tudinally, said cutting` tool having a body portion Within the tubular element With the cutting portion connected thereto through said slot to locate the cutting. poi'-y tion external ot ther tubular element, vsaid body portion having a threaded connection with the threaded element.

15. Apparatus as in claim le character* ized in thatythe rotatable movements oit the tubular and threaded erential synchronism.

16. pparatus as in claim le character` ized by a rotatable drive ineinber,faiid inde'- pendent drive connections'V between said drive member and the tubular and threaded elements.

17. Apparatus elements are YinV difiin claim la characterized by a rotatable driveijneinber, and independent drive connections between lsaid drive member and the tubularand threaded elements to cause rotationot said elements in the saine anfular direction and at difierent angular speeds to produceI a 'difl'erential VSynchronous movement therebetween.

i8. .ln portable apparatus ttor 're-surfac ing cylinders, a cutting tool, and means for supporting such tool relative to tliecylinder bore to provide toolfmovement inthe direction or length ot the bore With the movement selectively through a` cutting Vhelical path or a path ditlieringi'rom such helical path in the .rate or' advancethrough the bore under similar speed conditions-ot power applicationysaid meansA including ay rotatable'tubular element extending axially of the bore and operative to drive and guide the tool, saidy element being vrotatable at Will, means for advancing the tool lrelative to the element during tool movement in either path, said advancing means including a ized ii Y movements.

1 ,lava-o3 6 threaded element rotative inthe same an v gular direction Yand concurrently with the tubular element during tool niovementoiione of such paths,'and ineans for rotating Vsaid elements at different speeds ot rotation when the tool is traveling in such path.V

19.*lin portable apV aratus for iresurfacing cylinders, a cutting tool, and means 'for supporting sucli tool relative to the cylinder bore to provide tool inovem'entthrough a circular path-'and advancement in thel direction of the axis'ot'snch path, said means including` a rotatable tubular element extending axially of the bore andV operative to drive and guide the tool, means for advancing the tool during element ro` drive member and` the threaded element Vincludes a menilfier movable in unisonY with the threaded element Vand 'having an intei-nal gear, and a pinion operatively conneetingl saidV gear with the drive member.

ln portable apparatus for 'resurtacf ing'cylindors, a cutting tool, and means for supporting .auch tool relativo to the cylinder bore to provide toolfmovement through a circular path and advancement in the direc-1 tionor' the axis of such path, said vmeans including a rotatablertnbular element ex- .tending axially ott' the bore and operativ' to drive andV guide the tool, nieanstor advancing' the tool during element rotation, vsaid advancing means including a rotatable threaded element, said elements each car rying an internal gear tace. and a drive member operative concurrently onsaid gear.

faces for providing element rotational .22.111 portable apparatus tor re-surfacing cylinders.y a cutting tool, and means tor supportingsuch tool .relative to the cylinder for that the connections Ybetween the `bore to provide rtool movement tl'irougli .a circular path and advancement inthe direcj tion of the axis o-such path, said means including'arotatable tubular element extending axially of the bore and'operative Y Vto drivev and guide the tool, means forfad- Avanclng the tool during element rotation,

said advancing ineans including a rotatable threaded element, said elements each carrying an internal gear face With-the respective gear faces axially alined, and extending on different planes ltransverse or" the gear taceA axis, and a drive member operatively connected to the respective faces to drive the latter concurrently.

23. In portable apparatus for re-surfacing cylinders, a cutting tool, and means for supporting such tool relative to the cylinder bore to provide tool movement through a circular path and advancement in the direction of the axis of such path, said mea-ns including a rotatable tubular element extending axially of the bore and operative to drive and guide the-tool, means for advancing the tool during element rotation, saidadvancing means including a rotatable threaded element,'said elements each carrying an internal gear face with the respective gear faces axially alined and extending on different planes transverse of the gear face axis, and a drive member operatively connected to the respective faces to drive the latter concurrently, and in the same angular direction.

24. Apparatus as in claim 23 characterized in that the gear formation of the drive member is of equal diameter on the respective planes oi the gear faces, and the mean diameters of the respective gear faces differ from each other to cause rotational movement ot the tubular and threaded elements at different but synchronous speeds.

25. ln portable apparatus for re-surfacing cylinders, and wherein a cutting tool is moved in a circular cutting path having an axis coincident with the axis or" the cylinder bore and concurrently advanced in the direction of such axis during the cutting operation, means including a tubular and a threaded element for supporting the cutting tool during such tool movements, a-nd means for independently rotating said elements, said rotating means being Voperative to provide tool movements either in such cutting path or in a path parallel to the axis of such cutting path at will, said rotatable means including an actuating means forming th-e power source for said elements during tool movement in either of such paths.

26. In portable apparatus for re-surfacing cylinders, and wherein al cutting tool is moved in a circular cutting path having an axis coincident with the axis of the cylinder bore and concurrently advanced in the direction of such axis during the cutting operation, means including a tubular and a threaded element Jfor supporting the .cutting tool during such tool movements,

and means for independently rotating said elements, said rotating means being operative to provide tool movements either in such cutting path or in a path parallel to the axis of such cutting path at will, said rotating means including a drive member forming the power source for said elements during lmovement of the tool in either of such paths, the speed of advancing movement of the cutting tool in one of said paths differing from that when advanced in the other path in the presence of uniform speed of the drive member.

27. In portable apparatus for re-surfa-cing cylinders, and wherein a cutting tool is moved in a circular cutting path having an axis coincident with the axis of the cylinder bore and concurrently advanced in the direction of such axis during the cutting operation, means including a tubular and a threaded element for supporting the cutting tool during such tool movements, and means for independently rotating said elements, said rotating means including a drive member adapted to be operatively connected to and drive both elements at will, concurrent connection with both elements advancing the tool in such cutting path, said member being shiftable to limit operative connection to a connection with the threaded element, said latter connection beingoperative to move the tool in a path parallel to the axis of said cutting path.

28. In portable apparatus for re-surlacing cylinders, and wherein a cutting tool is moved in a circular cutting path having an axis coincidentwith the axis of the cylinder bore and concurrently advanced in the direction of such axis during the cutting` operation, means including a tubular and a threaded element for supporting the cutting tool during such tool movements, and means for ind-ependently rotating said elements, said rotating means including a drive member adapted to be operatively connected to and drive both element-s at will, concurrent connection with both elements advancing the tool in such cutting path, said member land said tubular element being relatively movable to limit such operative connections to a connection with the threaded ele-ment, said latter connection being operative to move the tool in a path parallel to t-he axis of such cutting path.

29. In portable apparatus for re-surfacing cylinders and wherein a cutting tool is moved in a circular cutting path having an axis coincident with the axis of the cylinder bore and concurrently advanced in the direction ofsuch axis during the cutting operation, means including a tubular and a threaded element for supporting the cut ting tool during such tool movements, said elements being held against longitudinal movement during tool movements, and means for independently rotating said elements, said means including a drive member adapted to be opera-tively connected to and drive both elements at will, and shiftable to provide sole connection with the threaded element.

30. In portable apparatus for re-sur'facing cylinders and wherein a cutting tool is moved in a circular cutting path Vhaving an aXis coincident With vthe axis of the cylinder l'bore and concurrently. advanced in the direction of such axis during the cutting operation, `.means including.. aV tubular. and ,a threaded element. for supportingk they cutting` tool vduringrsucli tool Y iiioveinents,fsa id elements being lield against longitudinal -Inovement Aduring Y Atool movements, and. means for independentlyY ro--r tating said elements, said means" including ashiitable drive member adapted to be operatively connected to the threaded `element Vin cit-lier of tivo positionofshitt ofthe mem-. ber, said connections being relatively arranged to produceV different speeds -ot yacl-- eration, means Vincluding a tubular and a threaded element for supporting theV cutting tool during such tool movementm said ele# ments being held against longitudinal mo vement during tool movements, and means for independently rotating said elements, said means including a drive member adapted to be yoperatively connected to and drive both elements at will, and shiftable to provide sole connections with the threaded. element,

`said member being operative toy drive both elements concurrently when inv oneof said positions. v

32. ln portable apparatustor re-surijaciiig cylinders and wherein a cutting tool is -moved in a circular cuttingpath having an axis coincident with the axis 'of the cylinder bore and'concurrently advanced in the direc-` tion of suchraxis duringthe cutting operation, means lincluding` a tubular and athreaded element 'for supporting thecutting tool during such tool movements, said ele-V ments being held against longitudinal move# ment during tool movements., and means. l'orl independently rotating said elements, said meansincluding a drive member adapted to be operatively connected to and drive both elements at will, and shiftable.. to provide sole connections with the threaded element,4 said member being operative to drive both elements .concurrently ivhen'in one of said positions, and inactive with respect -to the tubular element when in its other position.

33.*In portable apparatus riter reesurfac.-

ing cylinders, and wherein a' cutting-toolis movedin `a circular cutting path having an.

axis coincident with the axis of the cylin-A der bore and concurrentlyfadvancedin theV direction of such axis during-.the cutting operation, means including a tubular and a threaded element for supporting the cutting tool during such tool movements,said elementsy each carrying an internal gearface held against axial movement during tool movements, and meansfor vindependently rotating` said elements, said mea-ns including an axially shiftable drive member, independent pinions positioned to operatively engagethe respective 'gearl faces Vwith the drive member when the latter is in one position to co-ncurrently drive said elements, shifting kof said member being operative to'render vone oi' both of said gear faces inactive atWill. d 847. In. portable apparatus for 11e-surfacing cylin'cers and wherein Va cutting tool;V 'is moved in a circular cutting path having an axis coincident With the axis oi the cylinder bore and concurrently advanced in the direction'oil such axisduring the Vcutting operation, means :including a tubular' and a threaded element for supporting the cutting tool during such tool movements, said elements carrying internal gearr faces held against yaxial movement during-V tool movement, and means for independently rotating said elements, Vsaid means including an axially sliiftable drive member, ,independent pinions positioned to operatively engage the ijespectivegear taces` with the drive inember when the latter isin one position, said gear faces, and pinions being` in permanent.

mesh, each gear Aface and its pinion extending on apla-ne intersectingtlie member axis, the respective planes being spaced aparta distance top/ermitsole activity of the member with one of said elements.

, vln portable apparatus for r'e-,suitacing` cylinders, and whereina cutting tool. is

moved in a circulancutting path. having an axis coincident with the axis of the. cylinder bore and concurrently advanced in the direction of such axis during the cutting operation, meansincluding a tubular vand a threadedelenient tor supportingthe cutting tool during such tool movements, and means Yfor independently rotating said elements, ysaid rot-ating` means including an axially shiftable drive member, and independent operative connections between said member and the threaded element and operative respectively to provide activity of said elements When the member is at either extreme of `its shitting movement. Y

36,'n apparatus torre-surfacing cylin-V ders Yand in combination, avcutting tooll and its support,`said support having means to permit positioning thereof in predeterminedk position relative 'to the cylinder'to be resurfaced with the supportextending axially ofthe cylinder bore, means carried by the support for providing cutting movements of the tool ivhiletlie support is-in position, said' support andmeans being formed to permit location of the tool in an inactive position relative tothe borel While the support is in position,V and a burnishing instrumentality positionable relative to 'the bore and to said means to provide burnishing action by means movement while the cutting tool is located in its position of inactivity, said support having a formation to permit positioning of the instrumentality while the support is maintained in the position occupied during cutting tool activity.

37. Apparatus as in claim 36, characterized in that the support includes two elements pcsitionable relative to the bore from vopposite ends ot the cylinder structure, said elements having compleinental configurations adapted 'to retain both elements in definite relation beyond the cutting zone when one of the elements is secured to the cylinder structure.

38. Apparatus as in claim 36 characterized in that the support includes two elements positionable relative to the bore from opposite ends of the cylinder structure, one of said elements extending through the cylinder bore with the other element positioned to concurrently engage the tree end of the iirst element and an external wall-ot the cylinder structure, said elements being operative to retain said :tree end in predetermined position.

39. In portable apparatus i'or re-sur'facing cylinders and wherein a cutting tool and a burnishing tool are made-active successively upon a cylinder bore, means including a rotatable tubular element for supporting the cutting tool to provide movement of. the cutting face in a circular path having its axis coincident with the cylinder bore, means for feeding the tool in the direction of length oi said element, said element having a configuration to permit location of a burnishing tool in contact with the bore tace and rotate it by rotating movements of the element.

40. in portable apparatus for re-surtacing cylinders and wherein a cutting tool and a burnishing tool are made active successively upon a cylinder bore, means including a rotatable tubular element `for supporting the cutting tool to provide movement ot the cutting tace in a circular path having its axis coincident with the cylinder bore, means for t'eeding the tool in thc direction of length oi' said element, said element having a contiguration to permit location of a burnishing tool in contact with the bore Jface and rotate it by rotating movements ot the elements, and during inactivity ot the cutting tool feeding means.

Lil. ln a portable apparatus tor re-surtacing cylinders. a tubular element, means positionable at the opposite ends ot a cylinder bore tor supporting the opposite ends or" said element, said means having a coniiguration to produce a space external ot the element at points external of the bore when the appa` ratus is in posit-ion, a feeding element, axially alined with the tubular element, a cutting tool supported by said elements advancing toA permit tool movements through the bore by action ofthe feeding element, a shiftable drivemember, and means for operatively connecting the drive member to said elements, said member being positionable to causesaid connecting means to producethe following cycle of operations: rotate both elements in the same angular direction and at differential speeds to cause advancement of the cutting tool in a circular cutting path through the cylinder bore, render the connections with the tubular element inactive to permit return movement of the tool cutting tace to said space in a path parallel to lthe'cylinder axis, and render the connections with the tubular member active and the connection with the feeding element inactive to permit concurrent rotating movement ot both elements at the same speed.

ft2. Apparatus as in claim Lil characterized in that the tubular element is of a configuration to permit location otaburnishing tool thereon and in contact with the bore tace and permit feeding movement of the latter longitudinally of the bore by element rotation while both tubular and feeding elements are rotating at the same speed.

Li3. ln portable apparatus for resurfacing cylinders, and wherein a cutting tool is aci-- vanced in a circular cutting path having its axis coincident with the cylinder bore axis,

means tor supporting the cutting tool during such advancing movement, said means including an element extending through the cylinder bore and rotatableduring such tool advancing movement, and means for positioning said element with its axis coincident with the bore axis, said positioning means including a supporting trame adapted to contact with and be secured to aface of the cylinder casing, said Vframe having a bore external of the element with the trame bore wall provided with openings, and locating means insertible through said openings and movable into position between the element and the cylinder bore face to locate the element in proper axial relation and retain the traine against lateral displacement to disturb such relation during the frame securing period.

In portable apparatus for re-surfacing cylinders, and wherein a cutting tool is advanced in a circular cutting path having its axis coincident with the cylinder bore axis, means for supporting the cutting tool during such advancing movement, said means including an element extending through the cylinder bere and rotatable during such. tool advancing movement, and means for positioning said element with its axis coincident with the bore axis, said positioning to Contact with and be secured to a face of disiurb such relation kduring the frame se- '15 the cylinder casing,rsaid fra-me having a curing period.

bore external of the element with the frame In testimony whereof We affix our-signa- Y bore wall provided With openings, and va tures in presence of two Witnesses. v 5 pair of locating devices insertible through I LAF A. ANDERSON. i said openines and each havmr a portion O o movable into) position between 2rDtlie element JOHN M' MAC/RAE' andthe eylndei` bore face to locate the ele- Witnesses: Vment in proper axial relation 4and retain ANNA M. Domi,

l0 the frame agains'fJ lateral displacement to' CHAS. W. STAUFFIGER. 

